368 Miscellaneous. 



portion of the tentacular axis. These organs were of a paler tint 

 than the dorsal surface, and bore numerous white points. 



The genital orifices are on the right side of the animal, at the 

 level of the tentacles ; the anal aperture is on the same side, but 

 towards the middle of the body. 



The external differences recognizable between this animal and 

 Dendroiwtus, therefore, only relate to the arrangement of the termi- 

 nal portion of the tentacles. The internal anatomical characters are 

 much more important. The genus Marionia is not without relation 

 to Scyllcea. 



The buccal bulb is'more voluminous than that of Dendronotus ; and 

 the corneous maxillae are comparatively longer. 



The oesophagus, which is very long, opens into a first dilatation, 

 which is the gizzard ; it is in the interior of this cavity that we find 

 nearly forty cultriform teeth, placed side by side, and forming a 

 complete ring. This character occurs among Xudibranchs only in 

 the genus Scyllcea. A less dilated, but much longer region follows 

 the gizzard; it may be regarded as forming the true stomach. The 

 intestine, which follows it, opens, as already stated, upon the right 

 side of the body, near the middle part. 



We find in the division of the liver into two glands a further 

 character which approximates our moUusk to the genus Scyllcea. 

 The more voluminous of the two hepatic glands forms a compact 

 mass completely enveloped by the hermaphroditic gland — a pecu- 

 liarity which does not occur in Dendronotus, where the hermaphro- 

 ditic gland forms a distinct organ resting on the liver. The second 

 hepatic gland, which is much smaller than the other, is completely 

 isolated ; it is placed to the right beneath the gizzard. 



These two excretory organs pour their product, each by a dif- 

 ferent orifice, into the masticatory stomach, above the armature, and 

 immediately below the extremity of the oesophagus. We find this 

 arrangement also in the Scyllcece ; only, in place of two orifices, in 

 this type we distinguish three, at which the ducts of six or seven 

 hepatic glands terminate. 



We should have further to cite numerous dijfferences between the 

 genus Marionia and Dendronotus, both in the form of the nervous 

 centres, and in the number and arrangement of the annexed organs 

 of the generative apparatus. 



Although imperfect, all these data show that the genus Marionia, 

 notwithstanding a great external resemblance to the Dendronoti, 

 differs from those mollusks by its internal organization. The 

 armature of the stomachal region is an important character, esta- 

 blishing a relationship with the Scyllcece. We may say that 

 Marionia is a Dendronotus with the stomachal armature of Scyllcea. 

 The discovery of this new type consequently justifies the place 

 assigned by Woodward to Dendronotus in the family Tritoniidae. — 

 Comptes Eendus, July 30, 1877, p. 299. 



